Front material taking cantilever double helix of biomass power generation furnace

Abstract

The invention provides a biomass power generation furnace front material taking cantilever double helix, and relates to the technical field of biomass power generation equipment, the biomass power generation furnace front material taking cantilever double helix comprises two sets of material taking helixes arranged in parallel, each material taking helix comprises a driving motor, a spiral shaft and a connecting mechanism connecting the driving motor and the spiral shaft, and the spiral shafts are arranged in a rack; a capillary siphon lubrication system and an intelligent torque feedback system are further arranged in the rack, and the connecting mechanism is of a two-stage floating compensation structure and comprises a basic floating layer and a limiting guide layer which are sequentially arranged in the power transmission direction. The device has the beneficial effects that through a two-stage floating compensation structure, the spiral shaft can shake in the radial direction and be limited in the circumferential direction, wound straw is effectively scattered, and the material taking stability is improved; an intelligent torque feedback system monitors and regulates in real time, the winding problem is actively solved, and manual intervention is reduced; the self-lubricating sealing system prolongs the lubricating period, reduces the maintenance cost, integrally improves the reliability and economical efficiency of equipment, and meets the efficient and stable material taking requirement of biomass power generation.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of biomass power generation equipment, and particularly to a cantilever double helix for feeding in front of a biomass power generation furnace. Background Art

[0002] During the biomass power generation process, the stable operation of the feeding system in front of the furnace is a key link to ensure the efficient operation of the generator set. However, when the existing feeding screw equipment conveys fibrous biomass raw materials such as straw, it generally faces the problem of shaft jamming caused by straw winding, which seriously affects the feeding efficiency and equipment reliability. Traditional technologies mostly rely on a single mechanical floating structure (such as a simple universal joint or a linear spring support) or a passive cleaning device, and there are significant technical bottlenecks: First, the anti-overload ability is insufficient. A single floating structure can only achieve radial compensation at a limited angle and cannot adapt to the complex winding characteristics of high-humidity and long-fiber straw, resulting in a significant decrease in the conveying efficiency as the moisture content of the raw material increases; Second, the degree of automation is low. There is a lack of real-time monitoring and intelligent control mechanism. When the equipment has a winding fault, it needs to be manually shut down for cleaning, and the single cleaning takes more than 2 hours, seriously affecting the production plan; Third, the service life of key components is short. The connection interface between the screw shaft and the drive system is prone to bearing wear and seal failure due to insufficient lubrication and alternating load, and the average service life of the core components is short, and the maintenance cost is high.

[0003] In the prior art, it is found that none of its technical solutions effectively integrate multi-dimensional floating compensation, intelligent torque monitoring and anti-winding enhanced design; for example, the device disclosed in CN102798123A adopts a shaftless screw body with variable diameter and variable pitch, aiming to avoid material accumulation at the discharge port. However, its structure does not involve floating compensation or intelligent control, and the shaftless design may still have a winding risk when dealing with long-fiber straw; the fixed-stiffness spring support adopted by CN208560723U is prone to resonance, and there is no trajectory limiting mechanism, and the shaking trajectory of the screw shaft is not restricted.

[0004] These technical defects lead to a relatively high winding incidence rate of the existing equipment under complex working conditions, and the anti-overload ability and intelligent level are difficult to meet the actual needs of biomass power generation. Therefore, there is an urgent need to develop a feeding cantilever screw with composite innovative technologies to break through the existing technical bottlenecks and improve the stability and economy of the feeding system through the coordinated optimization of mechanical structure, control strategy and material technology.

[0005] It should be noted that the above content belongs to the technical cognition scope of the inventor. Due to the vast and extremely complex technical content in this field, the above content of this application does not necessarily constitute the prior art. Summary of the Invention

[0006] 1. Technical problems to be solved by the invention: The present invention provides a biomass power generation furnace front material taking cantilever double helix to solve the technical problems of the straw winding causing the shaft to be blocked, affecting the material taking efficiency and the equipment stability existing in the above-mentioned background technology.

[0007] 2. Technical solution: To achieve the above object, the technical solution provided by the present invention is: a biomass power generation furnace front material taking cantilever double helix, including two sets of juxtaposed material taking helices. The material taking helix includes a driving motor, a spiral shaft and a connecting mechanism connecting the two. The spiral shaft is arranged in a frame. A capillary siphon lubrication system and an intelligent torque feedback system are also arranged in the frame. The connecting mechanism is a two-stage floating compensation structure, including a basic floating layer and a limit guiding layer arranged in sequence along the power transmission direction; The basic floating layer realizes the radial shaking compensation of the spiral shaft, including a universal joint coupling. Its active end is fixedly connected with the output shaft of the driving motor through flange A, and its driven end is fixedly connected with the front end of the spiral shaft through flange B; The limit guiding layer realizes the circumferential limit and shaking trajectory constraint of the spiral shaft, including a sleeve-type limit seat fixed to the frame. A linear bearing is embedded in it and is in interference fit with the rear end of the spiral shaft. At least three groups of elastic support columns are circumferentially and evenly distributed on the outer peripheral wall of the limit seat. The two ends of the elastic support column are respectively connected with the limit seat and the frame; The intelligent torque feedback system includes a torque sensor, an electromagnetic clutch and an angle adjustment servo mechanism. The torque sensor is embedded on the connection interface between flange B and the front end of the spiral shaft. The electromagnetic clutch is arranged between the active end of the universal joint coupling and flange A. The output end of the angle adjustment servo mechanism is hinged with the universal joint coupling.

[0008] Further, a rigid connection structure of a spigot positioning and mating bolt group is adopted between flange A and the driving motor, and between flange B and the spiral shaft, allowing the spiral shaft to generate a deflection shaking of ±15° in the horizontal plane, and a 0.5 - 5 mm axial floating margin is reserved for the universal joint coupling.

[0009] Further, the capillary siphon lubrication system includes an annular oil cavity, an oil storage cavity and a capillary connecting the oil storage cavity and the annular oil cavity. A temperature sensing piston is arranged in the oil storage cavity. The annular oil cavity is opened in flange A.

[0010] Further, a plurality of radial oil holes are evenly distributed along the axial direction on flange A. The inner ends of the plurality of radial oil holes are communicated with the annular oil cavity, and the outer ends extend to the surface of the cross shaft journal of the universal joint coupling. A temperature-sensitive sealing ring is also arranged at the connection between flange A and the universal joint coupling.

[0011] Furthermore, a double-lip dust-proof sealing ring is provided at the rear end of the limit seat, and a plurality of connecting ear plates corresponding to the elastic support columns are provided on the outer wall of the limit seat.

[0012] Furthermore, the elastic support column includes a rubber-metal composite spring and a rod body, and its axis forms an angle of 15°-30° with the axis of the spiral shaft. A spherical roller bearing is provided between the elastic support column and the connecting ear plate, and the connecting end of the elastic support column and the frame is hinged through a hinge support.

[0013] Furthermore, the outer ring of the spherical roller bearing is in interference fit with the connecting ear plate, and the inner ring is rotatably connected to the front end of the rod body.

[0014] Furthermore, the torque sensor, the electromagnetic clutch, and the angle adjustment servo mechanism are all electrically connected through a PLC controller. The input end of the PLC controller is electrically connected to the signal output end of the torque sensor, and the output end of the PLC controller is respectively connected to the electromagnetic clutch and the angle adjustment servo mechanism.

[0015] Furthermore, the angle adjustment servo mechanism includes a servo hydraulic cylinder fixed to the frame, and one end of the output shaft of the servo hydraulic cylinder is hinged to the cross shaft component of the universal joint coupling through a linkage mechanism.

[0016] Furthermore, the frame includes a feeding bin and a driving bin. A partition is provided between the feeding bin and the driving bin. A waist-shaped groove corresponding to the spiral shaft is provided on the partition, and a brush is provided in the waist-shaped groove. The base floating layer, the capillary siphon lubrication system, and the intelligent torque feedback system are all provided in the driving bin.

[0017] 3. Beneficial effects: Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects: A double-stage floating system is formed through the universal joint coupling and the elastic limit structure, allowing the spiral shaft to radially sway within the range of ±15° and restricting the swaying trajectory. When the straw is wound, it can sway while rotating, effectively dispersing the entangled fibers, avoiding the shaft from getting stuck, improving the continuity of material taking, and significantly reducing the shutdown frequency caused by winding. The integrated torque monitoring and dynamic regulation mechanism can capture abnormal loads in real time and trigger the adaptive adjustment of the swaying angle of the spiral shaft. With the continuous drive of the motor, the winding straw can be dispersed without shutting down, and the single fault handling time is shortened to, improving production efficiency. The self-lubricating and sealing system extends the lubrication cycle, reduces the maintenance cost, improves the reliability and economy of the equipment as a whole, and meets the requirements of efficient and stable material taking for biomass power generation.

[0018] It should be noted that the structures not introduced in the present invention are the same as the prior art or can be implemented by the prior art since they do not involve the design key points and improvement directions of the present invention, and thus will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 is a schematic diagram of the feeding system structure of the present invention; Figure 4 is a schematic diagram of the basic floating layer structure of the present invention; Figure 5 is a sectional view of the flange A structure of the present invention; Figure 6 is a schematic diagram of the limit guiding layer structure of the present invention; Figure 7 is a schematic diagram of the elastic support column structure of the present invention; Figure 8 is a schematic diagram of the angle adjustment servo mechanism structure of the present invention.

[0020] REFERENCE SIGNS: 1, driving motor; 2, spiral shaft; 21, front end; 22, rear end; 3, basic floating layer; 31, universal joint coupling; 32, flange A; 321, radial oil hole; 33, flange B; 4, limit guiding layer; 41, limit seat; 411, connecting ear plate; 42, linear bearing; 43, elastic support column; 431, rubber-metal composite spring; 432, rod body; 433, self-aligning ball bearing; 434, articulated support; 5, capillary siphon lubrication system; 51, annular oil chamber; 52, oil storage chamber; 53, capillary; 6, frame; 61, feeding bin; 62, driving bin; 63, partition; 64, waist-shaped slot; 7, intelligent torque feedback system; 71, torque sensor; 72, electromagnetic clutch; 73, angle adjustment servo mechanism; 731, servo hydraulic cylinder; 732, link mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] For the convenience of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", "provided on" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0025] See attached Figure 1-8 The front feeding cantilever double spiral of the biomass power generation furnace comprises two sets of feeding spirals arranged in parallel, the feeding spiral comprises a driving motor 1, a spiral shaft 2 and a connecting mechanism connecting the two, the spiral shaft 2 is arranged in a frame 6, and a capillary siphon lubrication system 5 and an intelligent torque feedback system 7 are also arranged in the frame 6, and the connecting mechanism is a two-stage floating compensation structure, including a basic floating layer 3 and a limiting guide layer 4 arranged in sequence along the power transmission direction, the driving motor 1 is connected to the front end 21 of the spiral shaft 2 through the basic floating layer 3, and the rear end 22 of the spiral shaft 2 is connected to the frame 6 through the limiting guide layer 4, and the two-stage mechanism realizes the coordinated motion control of radial shaking compensation and axial limiting constraint, allowing the spiral shaft 2 to shake within the radial deflection range of ±15°, and at the same time, the shaking trajectory is limited to a conical space with a cone angle of 20°-30° through the limiting seat 41 and the elastic support column 43, so as to avoid rigid jamming caused by straw winding; The basic floating layer 3 realizes the radial wobbling compensation of the spiral shaft 2, including a universal joint coupling 31. The universal joint coupling 31 is of the cross-shaft type. Its driving end is fixedly connected to the output shaft of the driving motor 1 through a flange A 32, and its driven end is fixedly connected to the front end 21 of the spiral shaft 2 through a flange B 33. The limit guiding layer 4 realizes the circumferential limit and wobbling trajectory constraint of the spiral shaft 2, including a sleeve-type limit seat 41 fixed to the frame 6. A linear bearing 42 is embedded therein and is in interference fit with the rear end 22 of the spiral shaft 2. At least three groups of elastic support columns 43 are circumferentially distributed on the outer peripheral wall of the limit seat 41, and both ends of the elastic support columns 43 are respectively connected to the limit seat 41 and the frame 6. The intelligent torque feedback system 7 includes a torque sensor 71, an electromagnetic clutch 72, and an angle adjustment servo mechanism 73. The torque sensor 71 is embedded in the connection interface between the flange B 33 and the front end 21 of the spiral shaft 2. The electromagnetic clutch 72 is arranged between the driving end of the universal joint coupling 31 and the flange A 32. The output end of the angle adjustment servo mechanism 73 is hinged to the universal joint coupling 31.

[0026] Both of the two spiral shafts 2 adopt variable-pitch spiral blades. The pitch P1 at the feeding end is greater than the pitch P2 at the discharging end. The free edge of the blade is provided with a serrated structure, and a tungsten carbide wear-resistant coating is sprayed on the blade surface. Combined with the hydrophobic nano-coating on the surface of the spiral shaft, the straw adhesion rate is reduced, and the assembly distance between the two spiral shafts 2 is much larger than the floating distance generated by the simultaneous wobbling of the two.

[0027] Both between the flange A 32 and the driving motor 1 and between the flange B 33 and the spiral shaft 2 adopt a rigid connection structure with a spigot positioning and bolt group, allowing the spiral shaft 2 to generate a ±15° deflection wobbling in the horizontal plane. And the universal joint coupling 31 reserves an axial floating margin of 0.5 - 5 mm. The rigid connection ensures efficient power transmission. The spigot positioning accuracy ≤ 0.02 mm, avoiding vibration caused by the eccentricity of the coupling. The radial deflection ability of the universal joint enables the spiral shaft 2 to actively adjust its posture when the straw is wound. Combined with the axial floating margin, a compound motion of rotating and wobbling is realized, effectively dispersing the entangled fibers.

[0028] The capillary siphon lubrication system 5 comprises an annular oil chamber 51, an oil storage chamber 52 and a capillary 53 connecting the oil storage chamber 52 and the annular oil chamber 51. A temperature sensing piston is arranged in the oil storage chamber 52. Lubricating oil is injected into the oil storage chamber 52. The temperature sensing piston automatically adjusts the piston displacement as the ambient temperature changes. The annular oil chamber 51 is opened in the flange A32. The annular oil chamber 51 is connected to the universal joint coupling 31 through a plurality of radial oil holes 321. A plurality of radial oil holes 321 are evenly distributed along the axial direction on the flange A32. The inner ends of the plurality of radial oil holes 321 are connected to the annular oil chamber 51, and the outer ends extend to the surface of the cross shaft journal of the universal joint coupling 31. A linear guide groove is arranged on the cross shaft journal of the universal joint coupling 31 to realize dynamic lubrication of the contact surface between the cross shaft and the bearing. The migration path of lubricating oil driven by the siphon effect: the lubricating oil is driven by the capillary siphon effect to pass through the capillary 51 under the push of the temperature sensing piston in the oil storage chamber 52. 3 overcomes the gravity difference and migrates to the annular oil chamber 51, forming a lubricating oil film with a pressure of about 0.1-0.3MPa. Under the centrifugal force and oil film pressure generated by the shaking of the spiral shaft 2, the lubricating oil in the annular oil chamber 51 is transported to the hinge point of the universal joint through the radial oil hole 321 and the guide groove of the cross shaft, and the universal joint coupling 31 is dynamically lubricated to achieve pumpless self-lubrication. The lubrication cycle is ≥2000 hours. A temperature-sensitive sealing ring is also provided at the connection between the flange A32 and the universal joint coupling 31. The temperature-sensitive sealing ring forms a pre-compression amount with the surface of the cross shaft journal. When the temperature changes and causes the journal to expand thermally, the sealing ring can automatically adjust the radial tension to maintain the sealing pressure and prevent the lubricating oil from leaking to the drive motor 1 side. In another embodiment, an oil return hole can be opened at the bottom of the flange A32 to communicate with the lowest point of the annular oil chamber 51 to ensure that the excess lubricating oil flows back to the oil storage chamber 52 under the action of gravity to avoid blockage of the lubrication system.

[0029] A double-lip dustproof sealing ring is provided at the rear end of the limit seat 41, and a plurality of connecting ear plates 411 corresponding to the elastic support columns 43 are provided on the outer wall of the limit seat 41. Each group of elastic support columns 43 is interference fit with the connecting ear plates 411 of the limit seat 41 through a self-aligning ball bearing 433. The interference fit between the outer ring of the self-aligning ball bearing 433 and the connecting ear plates 411 is 0.01-0.03mm. The elastic support column 43 is hinged with the hinge support 434 on the frame 6, and the hinge axis and the rod body 432 are allowed to swing by ±10°.

[0030] The elastic support column 43 includes a rubber-metal composite spring 431 and a rod body 432. Its axis forms an angle of 15° - 30° with the axis of the spiral shaft 2. A spherical roller bearing 433 is arranged between the elastic support column 43 and the connecting ear plate 411. The connecting end of the elastic support column 43 and the frame 6 forms a hinge through a hinge support 434; the outer ring of the spherical roller bearing 433 is in interference fit with the connecting ear plate 411, and the inner ring is rotatably connected to the front end of the rod body 432. The spherical roller bearing 433 cooperates with the hinge support 434 to form a three-way elastic constraint, which not only allows the spiral shaft 2 to radially shake, but also provides a restoring force through the elastic modulus of the rubber-metal composite spring 431. Here, the elastic modulus is adjustable from 5 to 20 N / mm, limiting the shaking amplitude within a safe range. Moreover, the axis of the elastic support column 43 forms an angle of 15° - 30° with the axis of the spiral shaft 2, making the shaking trajectory form a stable conical surface. The amplitude of this shaking trajectory is smaller than the assembly spacing of the two spiral shafts 2, preventing collisions and avoiding damage to the equipment caused by irregular vibrations.

[0031] The torque sensor 71, electromagnetic clutch 72, and angle adjustment servo mechanism 73 are all electrically connected through a PLC controller. The input end of the PLC controller is electrically connected to the signal output end of the torque sensor 71, and the output end of the PLC controller is respectively connected to the electromagnetic clutch 72 and the angle adjustment servo mechanism 73. The torque sensor 71 is embedded in the connection interface between the flange B33 and the front end 21 of the spiral shaft 2. A strain gauge type sensor is used and pasted on the journal surface. The signal is transmitted to the PLC controller through a shielded wire. The electromagnetic clutch 72 is connected in series between the driving end of the universal joint coupling 31 and the output shaft of the driving motor 1, and the power is switched on and off through a toothed clutch. The angle adjustment servo mechanism 73 includes a servo hydraulic cylinder 731 fixed on the frame 6. One end of the output shaft of the servo hydraulic cylinder 731 is hinged to the cross shaft component of the universal joint coupling 31 through a link mechanism 732. The length of the link is adjustable to achieve ±15° deflection angle control; the torque sensor 71 monitors the load in real time. When the torque exceeds 1.5 times the rated value, the PLC controller triggers the electromagnetic clutch 72 to disconnect for 0.3 - 0.5 seconds, causing the spiral shaft 2 to have an instantaneous idling impact, and cooperating with the angle adjustment servo mechanism 73 to increase the deflection angle to 12° - 15°, enhancing the effect of breaking up entangled straw, achieving the purpose of automatic control process without manual intervention, with a response time ≤ 0.2 seconds and the fault handling efficiency increased by 80%.

[0032] The frame 6 includes a feeding bin 61 and a driving bin 62, a partition 63 is provided between the feeding bin 61 and the driving bin 62, a waist-shaped groove 64 corresponding to the screw shaft 2 is provided on the partition 63, a brush is provided in the waist-shaped groove 64, and a certain floating space is provided between the waist-shaped groove 64 and the screw shaft 2. The opening of the waist-shaped groove 64 can not only ensure the normal movement of the screw shaft 2, but also effectively block the entry of straw through the brush or other flexible sealing materials, thereby playing a sealing role; the basic floating layer 3, the capillary siphon lubrication system 5 and the intelligent torque feedback system 7 are all arranged in the driving bin 62, and the driving components are isolated to an independent space through the partition 63, which can prevent the invasion of straw from causing the coupling to get stuck, the flange connection to get loose, and other problems, thereby reducing the wear and failure risks of the components, and an inspection window is provided at the upper end of the driving bin 62 to facilitate later maintenance and extend the service life of the equipment.

[0033] In this embodiment, the device is horizontally installed at the bottom of the straw silo. According to the boiler load requirements, the straw fuel is adjustable and pushed out of the silo to the secondary feeding device. The working process is as follows: Stable feeding under normal working conditions: two sets of feeding screws are started at the same time, the driving motor 1 runs at a speed of 20rpm, the screw shaft 2 transports the straw from the feed end to the discharge end through the variable pitch blades, the pitch gradually changes from 300mm to 200mm, and the blade serrations initially break up the fiber clusters; the limit seat 41 constrains the axial position of the screw shaft 2 through the linear bearing 42, and the elastic support column 43 allows it to shake radially within the range of ±10°, and the rubber-metal composite spring 431 provides a reset force to ensure automatic return to the center after shaking; the capillary siphon lubrication system 5 continuously replenishes lubricating oil to the annular oil chamber 51, lubricates the universal joint bearing through the radial oil hole 321 and the guide groove, and the sealing ring maintains a sealing pressure of 0.2MPa without leakage.

[0034] Intelligent elimination of straw entanglement: The trigger condition is that when the torque sensor 71 detects that the load torque rises to 180NN・m, the PLC controller determines that straw entanglement occurs; at this time, the PLC controller immediately cuts off the power supply of the electromagnetic clutch 72, and the drive motor 1 and the screw shaft 2 are disconnected for 0.4 seconds. The screw shaft 2 idles due to inertia, and an instantaneous pulling force is generated on the entangled straw, and some loose windings are torn off. The servo hydraulic cylinder 731 synchronously drives the connecting rod mechanism 732 to increase the deflection angle of the universal joint from the initial 5° to 15°, and the shaking amplitude of the screw shaft 2 is enlarged. The sawtooth blades cut the tangled fibers with a larger swing amplitude. The PLC controller adjusts the speed of the drive motor 1 to a sinusoidal wave mode of 15-25rpm (cycle 10 seconds) at the same time, and forms a compound breaking-up effect of "speed change + trajectory deviation" with shaking. After 30 seconds, the torque is detected. If it drops below 120N·m, normal operation is restored. During the winding period, the temperature sensing piston generates heat due to friction (the bearing temperature rises to 60°C) and pushes the oil storage chamber 52 to supply an additional 1.5 times the normal amount of oil to the annular oil chamber 51 to ensure the lubrication safety of the universal joint under high load. In summary, the device has a high success rate for single-time digestion of straw entanglement clusters, and the average processing time is greatly improved compared with the traditional shutdown cleaning efficiency. It adopts a modular floating connection structure, and the core components (universal joints, limit sleeves) are all quickly disassembled and assembled by bolts. With the self-lubricating guide assembly, the maintenance cycle of key parts is extended, the overall maintenance cost is reduced, and it combines reliability and economy.

[0035] The above-described embodiments only represent certain implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent of the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention; therefore, the protection scope of the invention patent of the present invention should be subject to the appended claims.

Claims

1. The cantilever double screw for taking material in front of the biomass power generation furnace includes two sets of taking material screws arranged in parallel, characterized in that: The material taking screw comprises a driving motor (1), a screw shaft (2) and a connecting mechanism connecting the two, the screw shaft (2) is arranged in a frame (6), and a capillary siphon lubrication system (5) and an intelligent torque feedback system (7) are also arranged in the frame (6), and the connecting mechanism is a double-stage floating compensation structure, comprising a basic floating layer (3) and a limiting guide layer (4) arranged in sequence along the power transmission direction; The base floating layer (3) realizes radial shaking compensation of the screw shaft (2), and comprises a universal joint coupling (31), the driving end of which is fixedly connected to the output shaft of the drive motor (1) through a flange A (32), and the driven end of which is fixedly connected to the front end (21) of the screw shaft (2) through a flange B (33); The limiting guide layer (4) realizes the circumferential limiting and shaking trajectory constraint of the screw shaft (2), and comprises a sleeve-type limiting seat (41) fixed to the frame (6), a linear bearing (42) is embedded in the inner part of the limiting seat and is interference-fitted with the rear end (22) of the screw shaft (2), and at least three groups of elastic support columns (43) are evenly distributed on the outer peripheral wall of the limiting seat (41), and the two ends of the elastic support columns (43) are respectively connected to the limiting seat (41) and the frame (6); The intelligent torque feedback system (7) comprises a torque sensor (71), an electromagnetic clutch (72) and an angle adjustment servo mechanism (73); the torque sensor (71) is embedded in the connection interface between the flange B (33) and the front end (21) of the screw shaft (2); the electromagnetic clutch (72) is arranged between the active end of the universal joint coupling (31) and the flange A (32); and the output end of the angle adjustment servo mechanism (73) is hinged to the universal joint coupling (31).

2. The cantilever double screw for front feeding of biomass power generation furnace according to claim 1 is characterized by: A rigid connection structure of a stopper positioning matching bolt group is adopted between the flange A (32) and the drive motor (1), and between the flange B (33) and the screw shaft (2), allowing the screw shaft (2) to deflect and shake by ±15° in a horizontal plane, and the universal joint coupling (31) reserves an axial floating margin of 0.5-5 mm.

3. The cantilever double screw for front feeding of biomass power generation furnace according to claim 1 is characterized by: The capillary siphon lubrication system (5) comprises an annular oil chamber (51), an oil storage chamber (52), and a capillary (53) connecting the oil storage chamber (52) and the annular oil chamber (51); a temperature sensing piston is provided in the oil storage chamber (52); and the annular oil chamber (51) is opened in the flange A (32).

4. The cantilever double helix for front feeding of biomass power generation furnace according to claim 3 is characterized by: The flange A (32) is provided with a plurality of radial oil holes (321) evenly distributed along the axial direction, the inner ends of the plurality of radial oil holes (321) being in communication with the annular oil chamber (51), and the outer ends extending to the cross shaft journal surface of the universal joint coupling (31), and a temperature-sensitive sealing ring is also provided at the connection between the flange A (32) and the universal joint coupling (31).

5. The cantilever double screw for front feeding of biomass power generation furnace according to claim 1 is characterized in that: A double-lip dustproof sealing ring is provided at the rear end of the limit seat (41), and a plurality of connecting ear plates (411) corresponding to the elastic support columns (43) are provided on the outer wall of the limit seat (41).

6. The cantilever double screw for front feeding of biomass power generation furnace according to claim 5 is characterized by: The elastic support column (43) comprises a rubber-metal composite spring (431) and a rod body (432), the axis of which forms an angle of 15°-30° with the axis of the screw shaft (2), a self-aligning ball bearing (433) is provided between the elastic support column (43) and the connecting ear plate (411), and the connecting end of the elastic support column (43) and the frame (6) is hinged via a hinged support (434).

7. The cantilever double screw for front feeding of biomass power generation furnace according to claim 6 is characterized by: The outer ring of the self-aligning ball bearing (433) is interference-fitted with the connecting ear plate (411), and the inner ring is rotatably connected to the front end of the rod body (432).

8. The cantilever double screw for front feeding of biomass power generation furnace according to claim 1 is characterized by: The torque sensor (71), the electromagnetic clutch (72) and the angle adjustment servo mechanism (73) are all electrically connected via a PLC controller; an input end of the PLC controller is electrically connected to a signal output end of the torque sensor (71); and an output end of the PLC controller is respectively connected to the electromagnetic clutch (72) and the angle adjustment servo mechanism (73).

9. The cantilever double screw for front feeding of biomass power generation furnace according to claim 8 is characterized by: The angle adjustment servo mechanism (73) comprises a servo hydraulic cylinder (731) fixed on the frame (6), and one end of the output shaft of the servo hydraulic cylinder (731) is hinged to the cross shaft component of the universal joint coupling (31) through a connecting rod mechanism (732).

10. The cantilever double screw for front feeding of biomass power generation furnace according to claim 1, characterized in that: The frame (6) comprises a feeding bin (61) and a driving bin (62); a partition (63) is provided between the feeding bin (61) and the driving bin (62); a waist-shaped groove (64) corresponding to the screw shaft (2) is provided on the partition (63); a brush is provided in the waist-shaped groove (64); and the base floating layer (3), the capillary siphon lubrication system (5) and the intelligent torque feedback system (7) are all arranged in the driving bin (62).

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